如何使用fileupload工具来实现文件上传
1。需要两个夹包文件：
commons-fileupload-1.2.1.jar、
commons-io-1.4.jar
2。页面文件上传
<form action="upload" method="post" enctype="multipart/form-data"> file:<input type="file" name="file" /><br/> username:<input type="text" name="username"/><br/> <input type="submit" value="submit"/> </form> </body>
package org.yinhe.servlet;import java.io.File;import java.io.IOException;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;@SuppressWarnings("serial")public class UpLoadServlet extends HttpServlet {@SuppressWarnings("unchecked")public void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {DiskFileItemFactory factory = new DiskFileItemFactory();ServletFileUpload upload = new ServletFileUpload(factory);try {FileItem item = null;List<FileItem> items = upload.parseRequest(request);for (int i = 0; i < items.size(); i++) {item = items.get(i);if(item.isFormField()){//如果是普通的控件String fileName = item.getFieldName();String username = item.getString();System.out.println(fileName + ":" + username);}else{//如果是文件上传的控件，一般我们需要将//其内容转化为一个文件，并保存到服务器上面。//item.getName()返回的文件名:某些操作系统//，返回的文件名包含了路径，有一些不包含。String name = item.getName();String name2 = name.substring(name.lastIndexOf("/")+1);System.out.println("name:"+name2);//获取保存文件的路径//getRealPath:返回服务器的某个目录的绝对路径。String path = this.getServletContext().getRealPath("upload");System.out.println("path:" + path);item.write(new File(path+"/" + name2));}}} catch (Exception e) {throw new ServletException(e.getMessage());}response.sendRedirect("sucess.jsp");}}